GNU wget up to 1.25.0 HTML src/convert.c html_quote_string heap-based overflow

Summaryinfo

A vulnerability categorized as critical has been discovered in GNU wget up to 1.25.0. Impacted is the function html_quote_string of the file src/convert.c of the component HTML Handler. Executing a manipulation can lead to heap-based overflow. This vulnerability appears as CVE-2026-58472. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability classified as critical was found in GNU wget up to 1.25.0. This vulnerability affects the function html_quote_string of the file src/convert.c of the component HTML Handler. The manipulation with an unknown input leads to a heap-based overflow vulnerability. The CWE definition for the vulnerability is CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

GNU Wget through 1.25.0, fixed in commit dd692d9, contains a heap buffer overflow vulnerability in the html_quote_string() function in src/convert.c that allows a remote attacker to trigger memory corruption by supplying a crafted HTML attribute with a large number of characters requiring entity encoding. A server-supplied HTML attribute causes a signed integer counter to overflow during output size accumulation, resulting in an undersized heap allocation and subsequent heap buffer overflow during the copy phase.

The advisory is available at gitlab.com. This vulnerability was named CVE-2026-58472 since 06/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/07/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Automation Software

Vendor

• GNU

Name

• wget

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25.0

License

• open-source

Website

• Vendor: https://www.gnu.org/

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